Deep rim for pneumatic tires



Dec. s, 1927. f l 1,652,141

. A. MICHELIN DEEP RIM FOR PNEUMATIC TIRES Original Filed April 10. 1924 2 SheetsSheet Dec. 6, 1927.

` A. J. MICHELIN DEEP RIM FOR PNEUMATIC TIRES 2 Sheets-Sheet 2 orignai Filed April 1o. 1924 Patented Dec. 6,' 1927.

UNITED STATES e 1,652,147 PATENT OFFICE,

ANDRE JULES MICHELIN, OE PARIS, FRANCE, AssrGNoR ro MI'CEELIN Er CIE., or

CLERMONT-FERRAND, FRANCE, .A CORPORATION or FRANCE.v y

DEEP 31M FOR PNEUMATIC TIRES.

Original application led April 10, 1924, Serial'NO. 795,605, and in France Januarylli, 1924. Divided en d this application led `February 18, 192.7. Serial No. 169,368.. l i

This'invention is a divisi-on ofwmyapplication entitled Improvements in deep rims for pneumatic tires, filed April 10, 1924, Serial No. 705,605, and relates to deep rims for automobile wheels which are provided with pneumatic tires, and has for its principal object to provide a riml of this type which, while retaining all of the advantages inherent thereto as regards the mounting and demounting of the tires, will, 'at the same time, eliminate the possibility of the beads of the tire entering the deep rim channel should the tire become partially deflated while in use, which condition hasheretofore resulted in the tire coming Oif of the rim entirely, with the consequent disastrous results in numerous instances.

The so-called deep rim for automobile,

wheels and tires, usually comprises a metallic annulus of substantially channel shape in cross section, the web of which. is provided with a medial circumferentially depressed groove into which portions of the beads of the tire may enter when the tire is in its deflated condition, whereby the diametrically opposed portions ofthe said beads may drop below the flanges of the rim to the end that removal of the tire may be started at such point and carried on at successive points around the rim, without the Anecessity of providing a separate retaining ring which is detachable from the rim itself.

The beads, under normal operating conditions, are prevented from slip ing into the grooveby the 'nflation of the innertube of the tire, which I orces the said beads outwardly against the rim flanges. However, should t ie tire become partially deiiated, ordinarily no provision is made-to prevent the beads from slippin iiit'o the central circumferential groove with the result that if the vehicle is run with'the tires in this condition, they work their beads'over the retaining flanges and leave the rims entirely. With the present invention, however, provision isl made for preventing the beads from working away froinithe flanges and into the groove should the tire become partially deated, although the means plrovided may be readilyadjusted t e said beads to enter portions of to permit the groove for the purpose of removing a tire,

-when desired.

Reference 'is hadI to the accompanying drawings, wherein likereference characters groove. y t

Figure 4 1s a similar view to F lgure 2, but e designate like parts through lthe several views, and in which Figure l is an edge view of a rim and safety piece constructed according to my invention the tirebeing indicated thereon in dotted lines.

. '60 Figure 2 shows a section along the dotted line in Figure 1 and `looking 'in the direci tion ofthe arrows.

Figure 3 shows a section along the line 3-3 of Figure 2, the parts being shown on a larger scale and thesafety piece being shown -in full lines in the safety position, and in dotted lines in the withdrawn position, in which position the adjacent ortions of the beads of the tire can be move down into the cept that the safety piece is in the raised position to enable the beads lof the tire to be moved into the grooves for the purpose of either mounting the'tire on the rim, or removing the tire from the rim, as will be hereinafter described.

Referring first to Figures 1 to 3, vA represents a trough shaped rim having throng out themajor portion of its circumference a flat bottom a and curved side flanges o.

Throughout less than half of its circumference, preferably from-140 to 160 degrees,

form agroove A", having a flat bottom a and side walls a2, which walls may be either vertical, as shown in Figures 1 and 2, or tapered as shown inFigures 5 and 6. This bottom-wall a of the groove A0 is made inleis' this flat bottom a is shaped at itscenter to tegral with the rim and `its outer edges a merge into'the bottom wall a to provide a smooth face on which -they can engage the inner tube 'when distended.` Mounted approximately midway between the ends as of the grooveA", is the safety ieee B, which as shown, is in the form o a bent plate,

provided with an arcuate upper surface I1 and inwardly projecting side ianges b'. This safety piece is mounted on the screw bolt C, being held between the head c of said bolt and the nut D, so that the said piece may be moved radially in and out with said screw bolt C. This screw bolt is also provided With the wing or other nut E by means of which the bolt C may be clamped at the desired position. This bolt Cpasses through the perforations in the bottom Wall a of the groove A", as shown in Figure 3. Obviously, if desired, the place of the bolt may be taken by the stem of the inner tube of the tire, which stem contains the tire valve and usually pro.- jects inwardly through the trame of the wheel. These stems are also usually threaded in substantially the same manner as the bolt C, so that it is only necessary to pass the stem through the aperture in the piece B to tighten up the lock nut against the said piece, whereupon the parts may be employed in exactly the same manner as that above disclosed.

Referring now to Figure 4, this shows la.

rim originally provided with a continuous groove A. The groove is bridged, however, through the major portion of its circumference by means of the arcuate bridge plate A2, leaving open a portion only of the original groove, as at A3. The side Walls of this groove may be made vertical, as shown in Figure El, or tapered as shown at a* in Figures 5 and G. At the outer'ends of these side Walls e* annular shoulders e? are formed in the rim, adjacent to the curved retaining ilanges a', and'on these shoulders the beads of the tire rest when the tire is in the inflated position, shown in Figure 5.

The safety piece ld has an arcuate top and side flanges (32, which flanges are parallel to the side Walls et of the groove A3.

This safety piece is held between the head c of the screw bolt andthe lock nut D, and the piece and screw bolt may be moved in or out together, both passingI through the opening` in the bottom wall of the groove A?, as shown in Figures 5 and 6. This holt is provided with 'the vvilur or other nut E,

uf'hich permits the elem to he drawn inwardly to the safety position, shown in Figure 5, or forced outwardly to the position for releasing the del-lated tire, as shown in Figure (i.

ln operation, in order to remove tlie'tire, the bolt carrying the safety piece must be lorced inwards liar enough into the cavity of the tire casing, as shown most `clearly in )Figure 6, to permit the heads olf the tire to be moved down into the groove, at which time the opposite side or the tire may be removed from the rim, and eventually the whole tire removed from the rim and a trash tire inserted In order to assemble the tire with the rim, reverse the operation.

As already stated in connection with Figures l'to 3,' instead of a screw bolt C, the usual valve stem may be used; but this is an obvious use of an old part and for the sake of clearness in the drawings, an independent screw bolt is shown. However, the operation is the same, whether the ordinary valve stem is used, or an independent screw bolt.

It will thus be seen that in both forms of the invention there is provided a rim for automobile Wheels1Wherein all of the advantages of the so-called deep rim are retained, While at the same time the possibility ol the tire coming off of the wheel, due to its beads slipping down into the groove of the dee rim when the tire becomes partially deflliited, is eliminated. Furthermore, the construction is such that. itmay be readily and inexpensively applied either to rims which are already in use, or to new rims.

Having thus described my invention, what I claim and desire to secure by Letters Patent of the United States is 1. A' deep rim attachment for vehicle wl1eelscomprising an annulus, substantially trough shaped in cross section, the bottom of which is provided with a medial bead receiving groove, said groove extending through less than half the circumference of the rim, and a radially adjustable safety piece, adapted to be moved into or out of the circumferential central portion of said groove, thereby preventing lthe tire beads from entering, or permitting the Saidbcads to enter said grooves when the tire is deflated, as desired.

2. A. deep rim attachment for vehicle wheels, comprising' an annulus, substantially trough shaped in cross section, the bottom of which is provided with a medial bead receiving groove; said groove through less than hall' the circumference ol the rinr, and a radially adjustable arcuate safety' piece having inwardly extending side flanges, adapted to he moved into or out of the circumferential central portion oft said groove, thereby preventing the tire beads Jfrom entering, or permitting the said beads .to enter said grooves when the tire is detinted, as desired.

3. rlr deep rim attachment for vehicle wheels, comprising an annulus, substantially trough shaped in cross section, the bottom o:t \vl1ich is provided with a medial bead re ceivinp; groove; said groove extending through less than halt the circumference of the rim, a screuT bolt passing radially through said rim near the circumferential center ol" said groove, a nut on said bolt, and a safety piece 'carried by said screw bolt, and adapted to be moved into or out of sald groove, thereby preventing the tire extending c beads from entering, or permitting the said beads to enter said grooves when the tire is deflated, as-desired.

4. A deep rim attachment for vehicle wheels, comprising an annulus substantially trough shaped in cross section, the bottom ot' which is provided with a medial bead receiving groove, said groove extending through less than half the circumference of the rim, a screw bolt passing radially through said rim near the circumferential center of said groove, a nut on said bolt, and a safety piece carried by said screw bolt and having inwardly extending side flanges, adapted to be moved into or out 'of Asaid groove, thereby preventing the tire beads' from entering,or permitting the said beads to enter said grooves when the tire is delated, as desired.

5. A deep rim attachment for vehicle wheels provided with pneumatic tires, comprising an annulus, substantially trough shaped in cross section, the bottom of which is provided with a medial bead receiving groove; said groove extending through less than half the circumference of the rim, a screw threaded valve stem'A secured with inner tube and passing radially through said rim near the circumferential center of said groove,a nut on said valve stem, and a safety piece carried by said valve stem, and adapted to be moved into or out of said groove, thereby preventing the tire beads from entering, or permitting the said beads to enter said grooves when the tire is deflated, as desired.

6. A deep rim attachment for vehicle Wheels provided with pneumatic tires, comprising an annulus substantially trough 'shaped in cross section, the bottom of which is provided with a medial bead receiving groove, said groove extending through less than half the circumference of the rim, a screw. threaded valve stem secured to the inner tube and passing radially through said rim near the circumferentialcenter of said groove, a nuton said valve stem, and a safety piece carried by saidvalve stem, and having inwardly extending side flanges, adapted to be moved into or out of said groove, thereby preventing the tire beads from entering, or permitting the said beads to enter said. grooves when the t-ire is deflated, as desired.

ANDR JULES MICHELIN. 

